If you feel a deep connection to the Elven smiths of lost Gondolin, or if you just want a magic glowing sword (and who doesn’t?), Spark IO has just the project for you: a sword that glows blue when it detects an unsecured Wi-Fi network. The do-it-yourself project requires a plastic replica of Bilbo’s sword from “The Hobbit”, an inexpensive Spark Core Wi-Fi development kit, and two AA batteries. When assembled, your Sting will detect nearby open Wi-Fi networks, glow blue, and publish a message on the network. Not guaranteed to kill Mirkwood spiders. follow link
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A Sting for Open Wi-Fi Networks